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Looking to upgrade your rear shock to a RockShox model? We love to hear it! While swapping your shock should be straightforward, a few essential checks and measurements can ensure a seamless process. This guide is designed to help you identify compatibility between your frame and our rear shocks: SidLuxe, Deluxe, Super Deluxe, Super Deluxe Coil, and Vivid.

First Point Of Contact

Your local bike shop or bicycle manufactuer should be the first place to source information when considering a shock upgrade. They can offer valuable insights into which shocks are compatible with your bike model as well as what the eye-to-eye and stroke lengths are to prevent any compatibility issues down the road.

Some brands will even go one step further and suggest suspension settings such as spring rate (air and coil), Compression, and Rebound settings. If you cannot get information from the manufacturer, we have a host of checks and measurements below.

If there is no specific information about which rear shocks will fit, there are a few things to consider before deciding on a new shock.

You've got a choice to make—an inline or reservoir shock

Alright, folks, imagine your mountain bike sitting in the garage, it's a dual suspension and you're looking at upgrading your shock. You've got a choice to make - a inline shock or a reservoir shock. What's the deal, and why should you care?

Inline Shocks:

Think of inline shocks like the ninja of mountain bike suspension—sleek, stealthy, and ready to rock. These bad boys are compact and take up the least amount of space in your frame. They're the go-to choice for XC (cross-country) or trail riders who want a lightweight and efficient shock but you will see these shocks on all kinds of bikes, up to enduro rigs.

Picture it this way: Inline shocks are like a hidden dagger. They are a compact package that delivers precise performance when you need it most. Perfect for those who want to climb like a mountain goat and descend like a downhill daredevil, all while keeping things lean and mean.

Reservoir Shocks:

Now, let's talk about reservoir shocks. These are the rockstars of the mountain biking world. Imagine a shock with an extra, well, "reservoir" canister attached to it. It's like strapping a nitrous oxide tank onto your bike – extra power, extra show!

Reservoir shocks are all about soaking up the big hits with style. When you're bombing down steep descents or launching off monster jumps, the extra oil volume and cooling capacity in that reservoir canister keep your shock cool and collected. It's like having an extra set of lungs to help you scream down the trail without breaking a sweat.

So, inline vs. reservoir?

It's all about the terrain and your riding style. If you're into long climbs and want to save energy, go inline. If you live for the adrenaline rush and demand top-notch performance on those epic descents, then it's time to reservoir your way to glory.

In the end, it's not about being better or worse; it's about choosing the shock that matches your biking mojo. Inline for precision, reservoir for power – the choice is yours, you two-wheeled trailblazers!

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Inline and Reservoir shocks have specific characteristics. IFP = Internal Floating Piston

Space In Your Frame

The first thing to consider is the style of rear shock you want or need for your frame: an in-line air shock, an in-line coil shock, or a reservoir-style system.

Switching from an in-line shock to a reservoir style system, like swapping a Deluxe to a Super Deluxe, requires some careful consideration. To assess compatibility, you can release air pressure from your current shock and cycle the suspension. While doing this, pay attention to any potential interference between the shock and objects on the frame, such as water bottles, cages, spare straps, or tubes. The available space around the shock can vary significantly depending on the bike model, as shown in the examples below. This step ensures that the new shock's reservoir design won't face any obstructions during suspension movement. 

Cycling your shock will give you a visual for any clearance issues

Shock Measurements, Explained

There are a few key measurements that you will need to know to determine the correct fit for you. These measurements include eye-to-eye, stroke, and mounting hardware.' The best course of action is to visit the manufacturer's website, consult your local bike shop, directly contact the manufacturer for guidance, or measure this yourself. If you are measuring it yourself, please make sure you have an accurate measuring device like digital calipers/verniers, as the stroke lengths change by 2.5mm, which is quite a small margin.

What Is Eye-to-Eye?

The eye-to-eye measurement refers to the total length of the shock from one mounting bolt to the other. It's a critical factor for proper fit and bike performance. Using a shock that is too long or too short can result in irreparable damage to your bike while also significantly altering its geometry. It's essential to ensure the shock's eye-to-eye measurement matches your bike's specifications.

To measure this yourself, take the measurement from the center of the shock mounting points, as illustrated below.

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What Is Stroke Length? 

The stroke length differs from the bike's overall travel due to linkages and rear wheel travel, which is measured from the rear axle. For the latest 'metric' shock sizing, each eye-to-eye length generally has four stroke length options. It's crucial to use the stroke length specified by your bike manufacturer.

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Many bicycle manufacturers will tell you the shock size on their websites

Friends don't let friends overstroke their shock. (Unless your bicycle manufacturer states you can.)

Changing the stroke of your shock may sound or seem like you are just getting secret extra travel for your bike and in a sense you may. But there are a huge amount of factors and concerns that come into play if you are using a stroke length that is longer than intended for your bicycle, which, at a minimum, can void any warranty you have on your bike, and can even cause serious injury or death for riders. Factors that can cause damage may extend to dynamic riding situations as opposed to clearance issues you can see in the workshop, these include but are not limited to:

  1. Contact between the wheel and seat stay. This can even occur under flex of the frame under High Compression situations. 
  2. Linkages over-rotate, damaging frames or becoming stuck.
  3. Excess force put onto linkages or frame mounts causing damage to the frame. 

Trunnion or Standard Eyelets?

Shock eyelets come in two styles: Trunnion and Standard. However, the choice between these two designs is determined by the bicycle manufacturer and cannot be altered by the user. Each style also corresponds to specific eye-to-eye lengths to ensure clarity and compatibility.

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Trunnion eyelets are employed to reduce the overall shock length in a bike, enabling frames to have a lower standover height and more mounting options. They typically eliminate the need for mounting hardware, attaching directly to a bearing or using a frame-supplied spacer or washer. 

Not all bicycle manufacturers will state that their bike is 'Standard' or 'Trunnion', however. If you are able to locate their shock sizes, you will find they align with the specific lengths listed above and this will indicate which style of mounting is needed.

Mounting Hardware

Mounting hardware is utilized for standard mounts and is entirely determined by the frame manufacturer. Its purpose is to enable the shock to fit into a frame where the pivots or mounting points are wider than the shock eyelets. When purchasing a new shock it is important to be aware that you may also need to order the appropriate mounting hardware. Nothing ruins a weekend of riding more than not having the correct hardware to install your new shock

The type and specifications of mounting hardware will be determined by the specific frame design from your bicycle manufacturer. Various options are available, depending on whether the bike employs bushings in the shock, among other factors.


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Mounting hardware comes in a host of sizes

Bearing Mounts

Some manufacturers will also opt for bearing mounts instead of utilizing a DU bushing and mounting hardware. This will be specified by the bicycle manufacturer for the most part. The bearing mounts from RockShox fit in the same dimensions as 8x30mm hardware. They are larger than standard mounting hardware, so it is important that this is approved by your bicycle manufacturer.

Coil or air?

There is a lot of debate about Air or Coil and we are not here to convert you either way. When it all boils down to it, your bicycle manufacturer will recommend whether a coil or air shock, will work best with your bike. Some bikes support both and in those instances, it may be trying both to see what suits your riding style.

As the coil on coil shocks are a larger diameter that travels the entire length of the shock they will require more space within a far as to not contact tubes of the frame. There are some specifics when it comes to coil shocks in terms of fitment. For the sake of this article only talking about 2023 product onwards, please review the below:

Bike that need specific coil shocks:

  • Commencal Meta TR Power
  • Specialized Kenevo

 These two bike models are only compatible with a Super Deluxe Air shock OR a 2023 Super Deluxe Coil shock WITH a steel shaft. 

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Coil or Air can be a polarizing topic to talk about at times

Shock Dimensions

Shock dimensions are crucial for a proper fit. Once you've determined your eye-to-eye, stroke, and mounting hardware requirements, you can delve into shock dimensions. These engineering drawings reveal potential clearance problems with your frame. Given our long history, we can't cover every shock we've made. Instead, we'll concentrate on RockShox products from 2023 onwards, as these are current and available in the market. This focus will assist you in ensuring compatibility and a smooth upgrade.

2023 Deluxe C1

Light on ounces and heavy on capability, Deluxe Ultimate adds a touch of luxury to the latest uber-capable trail bikes. From the new DebonAir+ air spring that offers more volume tunability than ever to the damper’s independent Low Speed Compression and Rebound adjustments—every aspect was carefully designed to maximize tunability into a streamlined, minimalist package. The power is in your hands to dial in the perfect-for-you, perfect-for-the-trail-ahead settings. A custom-tailored ride, every time. 

A condensed version of our Deluxe, Super Deluxe and Super Deluxe Coil is pictured below, but we suggest accessing the RockShox User Specification for Shock Fitment to confirm sizing in greater detail.


The Deluxe comes in the following models:

  • Deluxe Ultimate (Aftermarket & OEM)
  • Deluxe Select (OEM Only)**
  • Deluxe Select + (OEM Only)**

**OEM stands for Original Equipment Manufacturer. This means that these models of shocks will come specified on key models from bicycle manufacturers, but the shock model itself is not sold as an off-the-shelf solution for riders. The only off-the-shelf options are the 'Aftermarket' designated shocks.**


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All measurements are in mm

RC2T Damper

The RockShox RC2T reservoir is used in a few shocks, including the Super Deluxe C1, Super Deluxe Coil B1, and Vivid Ultimate. We have listed The RC2T reservoir for a couple of reasons. Firstly, this reservoir is used on Vivid, Super Deluxe and Super Deluxe Coil. This can be a great first check for fitment to see if your bike will accept a reservoir shock as this damper spreads across numerous shocks. Secondly, the reservoir is sold as a spare part that can be upgraded to the above-listed shocks, so it's important to note if you are upgraded to check that the dimensions will also fit.

Likewise, if your Select or Select+ shock is being upgraded to the RCT2 head, it is important you measure to see if this reservoir damper system will actually fit your frame. This is available as a spare part for Vivid and Super Deluxe. 

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RC2T Damper runs across Super Deluxe, Super Deluxe Coil & Vivid Ultimate rear shocks. All measurements are in mm.

2023 Super Deluxe C1

Super Deluxe Ultimate is the smart bet for the podium. Packed to the hilt with fine-tuning adjustments that meaningfully improve suspension performance, it’s the most advanced shock we’ve ever made. Pioneering one of the most impactful innovations in damper history, the new RC2T damper allows for 100% independent High and Low Speed Compression adjustments. The arsenal of elite technology rounding out Super Deluxe Ultimate is grounded in the philosophy that, at the highest level of capability, the extra ounce of performance and customization is what it takes to capture the crown.  

There are two air can options for these: Linear and Progressive. The Progressive can is the widest can and is pictured in the 2D drawings below. The linear will offer more clearance than the Progressive Aircan.

A condensed version of our Deluxe, Super Deluxe and Super Deluxe Coil is pictured below, but we suggest accessing the RockShox User Specification for Shock Fitment to confirm sizing in greater detail.

The Super Deluxe comes in the following models:

  • Super Deluxe Ultimate (Aftermarket & OEM)
  • Super Deluxe Select (OEM Only)**
  • Super Deluxe Select+ (OEM Only)**

**OEM stands for Original Equipment Manufacturer. This means that these models of shocks will come specified on key models from bicycle manufacturers, but the shock model itself is not sold as an off-the-shelf solution for riders. The only off-the-shelf options are the 'Aftermarket' designated shocks.**

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All measurements are in mm

Super Deluxe Coil B1 and Vivid Coil C1 

Although different in some their features, Super Deluxe Coil B1 and Vivid Coil do share the same silouhette in terms of their sizing on your bike. 

Vivid Coil C1 is our latest offering in ground ripping performance. Vivid C1 takes on technology from our Vivid Air rear shock, using our TouchDown Technology to bypass the first 10% of compression damping to deliver the ulitimate level of traction for your tires. The other benefits with Vivid are is; 100% independent High Speed and Low Speed Compression adjustment, increased bushing overlap for improved small bump performance, and optional Adjustable Hydraulic Bottom Out to tailor that bottomless feel. It’s the unmistakable feel of coil, evolved. A coil shock packed full of premium technology that gives you a hand in painting the experience of how you ride.

Super Deluxe Coil B1 shares many benefits from Vivid Coil C1 but does not offer the TouchDown Technology. 

A condensed version of our Deluxe, Super Deluxe and Super Deluxe Coil is pictured below, but we suggest accessing the RockShox User Specification for Shock Fitment to confirm sizing in greater detail.

The Vivid Coil C1 comes in then following models:

  • Vivid Coil Ultimate (Aftermarket & OEM)
  • Vivid Coil Ultimate Coil DH (Aftermarket & OEM)
  • Vivid Coil Select+ (OEM Only)**
  • Vivid Coil Select  (OEM Only)**
  • Vivid Coil (OEM Only)**

The Super Deluxe Coil comes in the following models:

  • Super Deluxe Coil Ultimate (Aftermarket & OEM)
  • Super Deluxe Coil Ultimate Coil DH (Aftermarket & OEM)
  • Super Deluxe Coil Select (OEM Only)**
  • Super Deluxe Coil Select + (OEM Only)**


**OEM stands for Original Equipment Manufacturer. This means that these models of shocks will come specified on key models from bicycle manufacturers, but the shock model itself is not sold as an off-the-shelf solution for riders. The only off-the-shelf options are the 'Aftermarket' designated shocks.**

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Vivid Ultimate C1

Big, bold, and built for pure downhill performance, Vivid Ultimate has unmatched tunability and damping for confidence in technical terrain. With an air spring that acts like a coil, this is the latest chapter in Vivid’s legacy of reliability and rock-smashing suppleness. This premium rear shock is built to push the limits on everything from downhill to E-MTB to enduro bikes. A condensed version of our Vivid fitment is pictured below, but we suggest accessing the RockShox User Specification for Vivid to confirm sizing in greater detail.

Vivid is available in the following models:

  • Vivid Ultimate (Aftermarket & OEM)
  • Vivid Ultimate DH (Aftermarket & OEM)
  • Vivid (OEM)**
  • Vivid Select (OEM)**
  • Vivid Select + (OEM)**

**OEM stands for Original Equipment Manufacturer. This means that these models of shocks will come specified on key models from bicycle manufacturers, but the shock model itself is not sold as an off-the-shelf solution for riders. The only off-the-shelf options are the 'Aftermarket' designated shocks.**

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All measurements are in mm

Measure Twice

When you have your shock it is important to cycle the suspension and make sure that there is no contact with the frame. We do this in the same way that we checked for space in the first few steps. It is important to let the air out of the shock and softly compress the suspension by hand. Below is a video on how to do so:

Hot tip: If there is low clearance, use a piece of paper between gaps to see if there's contact between the frame and the shock.


Known Fitment Issues

As a leading suspension brand, it's impossible for us to ensure compatibility with every existing frame and size combination. If you're considering a particular RockShox rear shock, we encourage you to consult your bicycle manufacturer. They may have insights into whether your frame can accommodate the specific shock you're interested in.

While we cannot cover all scenarios, we'd like to highlight that certain frames, particularly in specific sizes, might encounter challenges with certain shocks and potentially other sizes within that same model may not. It's crucial to exercise extra caution in such cases and seek clarification from your bicycle manufacturer for a precise assessment.

RC2T fitment issues: Super Deluxe, Super Deluxe Coil and Vivid Ultimate

  • 2020+ Specialized Demo - The reservoir may contact and damage the frame when the suspension is compressed.
  • 2020+ Cannondale Jekyll - Low Speed Compression dial will contact frame in the suspension cavity.  It is also difficult to inflate the shock. No option is optimal. 
  • 2020+ Canyon Strive - Threshold switch contacts frame when compressed. Currently the Canyon will only fit with a Ultimate DH head fitted to a 230x65 Vivid (Part Number: 11.4118.088.009)
  • 2020+ Orbea Wild - Low Speed Compression dial and Threshold Switch contacts frame 
  • 2022+ Ibis Oso - Threshold Lever can contact frame 

Vivid Specifically

  • 2020+ Specialized Kenevo - issues with air can size under bottom out
  • 2022+ Transition Relay
  • Trek Rail Gen 3 & Gen 4: Air can fitment issue
  • 2021+ Forbidden Dreadnought: Air can fitment at 40% + travel
  • Transition TR11: We have seen fitment issues on Medium and Large sizes 
  • 2023+ Giant Trance X Advanced E+ Elite: air can contact with the seat tube
  • 2018+ Lapierre Spicy - Vivid air can does not fit in the shock tunnel 
  • Santa Cruz Hightower 2 and 3: Issues with fitment in shock tunnel
  • Santa Cruz Heckler 8: Issues with fitment in shock tunnel
  • Transition Patrol Carbon: Issues with fitment in shock tunnel

Advanced Compatibility: Shock Tunes

Shock tunes refer to the High Speed Compression and Rebound circuits within the shock. We won't dive into any 'custom tuning' but rather we'd like to highlight that there are internal changes made to the shock by the bicycle manufacturer.

Many aftermarket RockShox rear suspensions come with a standard shock tune that falls in the middle of the range for both Rebound and Compression. If you want to fine-tune your shock to your bike's specific needs, it's advisable to obtain shock tune information from your bicycle manufacturer, as mentioned at the beginning of this article. If you wish to make these adjustments, contact your local bike shop, as it's a job best done by a professional. 

The Piston Tuning Guide is an online resource online and instructs riders to customize their shock to their specific requirements from their bicycle manufacturer.

Bike specific Vivid Ultimate Air Shocks

RockShox created a host of Vivid shocks for specific bikes on launch day. These shocks will have specific Compression, Rebound, mounting and air volume specifications to suit their respective bike. These are available and are specifically tuned to the following bikes:

  • CANYON SPECTRAL, 2018+, Part number: 00.4118.421.032
  • COMMENCAL CLASH 2019+ Part number: 00.4118.421.033
  • COMMENCAL META POWER SX 2020+, Part number: 00.4118.421.034
  • COMMENCAL META SX 2022+, Part number: 00.4118.421.035
  • GIANT TRANCE 2019-2021, Part number: 00.4118.421.057
  • NORCO SIGHT 2017-2019, Part number: 00.4118.421.058
  • NUKEPROOF DISSENT 2020+, Part number: 00.4118.421.036
  • NUKEPROOF MEGA 2021+, Part number: 00.4118.421.037
  • ROCKY MOUNTAIN ALTITUDE L+XL  2021+, Part number: 00.4118.421.060
  • SANTA CRUZ BULLIT 2021+, Part number: 00.4118.421.044
  • SANTA CRUZ MEGATOWER 2 2022+, Part number: 00.4118.421.045
  • SANTA CRUZ NOMA6 2023+, Part number: 00.4118.421.046
  • SANTA CRUZ  BRONSON 2023+, Part number: 00.4118.421.062
  • SCOR 4060 LT 2023+, Part number: 00.4118.421.061
  • SPECIALIZED  ENDURO 2020+, Part number: 00.4118.421.040
  • SPECIALIZED  LEVO SL (S2-S6 ONLY)  2022+, Part number: 00.4118.421.042
  • SPECIALIZED  STUMPY EVO CARBON 2021+, Part number: 00.4118.421.043
  • SPECIALIZED  LEVO (S2-S6 ONLY) 2020+, Part number: 00.4118.421.041
  • SPECIALIZED  KENEVO SL 2021+, Part number: 00.4118.421.063
  • TRANSITION REPEATER 2022+, Part number: 00.4118.421.047
  • TRANSITION SPIRE 2021+, Part number: 00.4118.421.048
  • TREK SESSION 2022+, Part number: 00.4118.421.050
  • TREK SLASH 2021 – 2023; Part number: 00.4118.421.051
  • YT CAPRA 29 2018+, Part number: 00.4118.421.054
  • YT  DECOY 29/MX 2019+, Part number: 00.4118.421.055

If you were not able to find the exact shock part number, refer to the steps above and have the shock tuned for your bike via a suspension professional. We have the Vivid Internal Shock Tunes available publicly. 

Looking to Learn More?

SRAM has fantastic learning resources, such as our service website and SRAM Tech YouTube channel.